linux-kernel - Re: [PATCH] Revert "tty: serial: pl011: add ttyAMA for matching pl011 console"

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Message-ID: <1489685286.16432.3.camel@redhat.com>
Date:   Thu, 16 Mar 2017 13:28:06 -0400
From:   Mark Salter <msalter@...hat.com>
To:     Russell King <linux@...linux.org.uk>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH] Revert "tty: serial: pl011: add ttyAMA for matching
 pl011 console"

On Thu, 2017-03-16 at 12:51 -0400, Mark Salter wrote:
> This reverts commit aea9a80ba98a0c9b4de88850260e9fbdcc98360b.

I see now that Aleksey already submitted a revert and it is in tty-next,
so ignore this.

> 
> It completely breaks PL011 SPCR support (a console=ttyAMA0 is
> required to get a console even with a valid SPCR table).
> 
> Aleksey Makarov also noticed this:
> 
>   https://lkml.org/lkml/2017/3/1/324
> 
> and he is working on a more generalized patch to fix the original
> "double printing" problem which this reverted patch was trying to
> fix.
> 
>   https://lkml.org/lkml/2017/3/15/223
> 
> So, let's revert the broken patch and live with the double printing
> until Aleksey's patch gets upstream.
> 
> Signed-off-by: Mark Salter <msalter@...hat.com>
> ---
>  drivers/tty/serial/amba-pl011.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 8789ea4..a81631f 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -2373,9 +2373,8 @@ static int __init pl011_console_match(struct console *co, char *name, int idx,
>  	if (strcmp(name, "qdf2400_e44") == 0) {
>  		pr_info_once("UART: Working around QDF2400 SoC erratum 44");
>  		qdf2400_e44_present = true;
> -	} else if (strcmp(name, "pl011") != 0 || strcmp(name, "ttyAMA") != 0) {
> +	} else if (strcmp(name, "pl011") != 0)
>  		return -ENODEV;
> -	}
>  
>  	if (uart_parse_earlycon(options, &iotype, &addr, &options))
>  		return -ENODEV;